[Bug]: Export uses the screen recording as the webcam when a project has no camera track

[lorenjphillips]

What happens

Exporting a screen-only recording (no webcam) renders the screen video a second time inside the webcam picture-in-picture frame.

Preview is correct. Only the export is wrong.

Steps to reproduce

1. Record the screen with the webcam off, so the session has no camera track.
2. Open it in the editor. Preview looks right, no webcam.
3. Export.
4. The exported file has the screen video duplicated in the PiP bubble.

Cause

The export handler (the one that runs after pickExportSavePath) builds its segments with:

webcamPath: i?.sourcePath ?? n.originalPath   // i = asset.cameraTrack, n = asset

?? only falls back on null/undefined. With no camera track i?.sourcePath is undefined, so webcamPath becomes the screen recording's own path and the compositor draws it as the webcam.

Two other call sites that build the same segment shape get it right.

Preview:

webcamPath: e.cameraTrack?.visible && e.cameraTrack.sourcePath ? e.cameraTrack.sourcePath : undefined

The other render-segment builder:

webcamPath: n && n.visible && n.sourcePath ? n.sourcePath : ""

Suggested fix

Match the other two:

webcamPath: i?.visible ? i.sourcePath : ""

The compositor already treats "" as "no webcam" — that's what setActiveClip passes on the preview path.

Also worth noting the export ignores cameraTrack.visible. Hiding the camera in the editor still exports it.

Why there's no workaround

• The Layout panel is disabled unless a clip has a cameraTrack, and the presets are only picture-in-picture / vertical-stack / dual-frame. Nothing turns the camera off.
• Hand-editing the .openscreen file doesn't help either. The schema is sourcePath: z.string().min(1), so an empty path fails validation, and any real path just gets composited.

I patched my local build with the one-line change above and the export is correct.

Environment

Openscreen 1.8.0, macOS 26.5.2 (25F84), Apple silicon.

[lorenjphillips]

Duplicate of #248 — already fixed by 91e3db8 on release/v1.9.0, verified on 1.9.0-rc.2.

My diagnosis was also wrong. webcamPath: cam?.sourcePath ?? asset.originalPath is intentional (the decoder needs a valid file to open); the actual bug was LiveParams::has_webcam defaulting to true and only being derived per clip in live.rs, so preview was correct and export was not.

Closing. Sorry for the noise — I filed against main without checking the active release branch or searching existing issues.